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Java Math Exercises: Test if a double number is an integer

Java Math Exercises: Exercise-3 with Solution

Write a Java program to test if a double number is an integer.

Sample Solution:

Java Code:

import java.util.*;
public class Example3 {
 public static void main(String[] args) {
  double d_num = 5.44444;
  if ((d_num % 1) == 0) {
   System.out.println("It's not a double number");
  } else {
   System.out.println("It's a double number");
  }
 }
}

Sample Output:

It's a double number

Flowchart:

Flowchart: Test if a double number is an integer.

Java Code Editor:

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Previous: Write a Java program to get whole and fractional parts from a double value.
Next: Write a Java program to round a float number to specified decimals.

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Java: Tips of the Day

Simple way to repeat a string:

String::repeat

". ".repeat(7)  // Seven period-with-space pairs: . . . . . . .

New in Java 11 is the method String::repeat that does exactly what you asked for:

String str = "abc";
String repeated = str.repeat(3);
repeated.equals("abcabcabc");

Ref: https://bit.ly/3bNqfWN